submersible warship

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Noun1.submersible warship - a warship designed to operate under water
pigboat, submarine, U-boat, sub - a submersible warship usually armed with torpedoes
combat ship, war vessel, warship - a government ship that is available for waging war
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References in periodicals archive ?
The German Type XXI high-speed, long-endurance, diesel-electric submarine was arguably the first modern submarine--a truly submersible warship. By the war's end over a hundred Type XXIs were working up in the Baltic Sea, but they made no operational patrols.
The hour long programme also followed engineers, designers and skilled craftsmen as they worked on the awe-inspiring submersible warship, from the initial stages of production to its first journey into the open sea.